CVE-2026-9625: CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in Rockwell Automation RSLinx Classic®
Description
A denial-of-service security issue exists within RSLinx® Classic. A crafted CIP packet with an oversized embedded message request can cause the RSLinx® Classic service to crash, requiring a restart of the service to recover.
CVSS v4.0
Score 8.7high
Affected software
Rockwell Automation
RSLinx Classic®
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, classified as CWE-120 (Classic Buffer Overflow), exists in RSLinx Classic. An attacker can send a specially crafted CIP packet with an oversized embedded message request to the service, which does not properly check the size of the input before copying it. This leads to a buffer overflow that crashes the RSLinx Classic service, resulting in a denial-of-service condition.
Potential Impact
Successful exploitation causes the RSLinx Classic service to crash, leading to denial of service. The service must be manually restarted to recover. There is no indication of code execution or data corruption beyond service disruption.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or workaround has been provided at this time.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Rockwell
- Date Reserved
- 2026-05-26T17:18:51.074Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a96d8b2acd9273b49c6bfa6
Added to database: 09/01/2026, 13:52:50 UTC
Last enriched: 09/07/2026, 14:43:42 UTC
Last updated: 10/15/2026, 18:48:26 UTC
Views: 68
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